AEECLSID_Transition2_Fader

The fader transition is a transition that applies a visual fade in/out effect
to the widget it wraps. For example, a popup menu could be wrapped by a
fader. Once displayed, the fader could be instructed to fade out the
wrapped popup over some period of time. As the fade out effect begins, the
wrapped popup would be drawn with an initial level of transparency (which
could, initially, be fully opaque), and then would gradually lose opacity
until it reached a final level of transparency.

Instantiaion

To create a fader transition, an application would do the following:

1. Create the object that will be the target of the fader transition
2. Call ISHELL_CreateInstance() with a class ID of
AEECLSID_TRANSITION2_FADER to retrieve a reference counted instance
of the fader transition.
3. Call Transition2Fader_Init() to setup and initialize the fader's
custom properties, including the target widget and the start/end
alpha values.
4. Call ITransitionMgr_Add() to add the transition to a manager.

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